Control of carburetors



May 10,1927. 1 1,627,951

M. J. BARBAROU CONTROL OF CARBURETORS Filed Feb. 23. 1924 Ma nus P bar a u INVENTOR;

1 Attorney.

Patented MayflO, 1927i 'LUNITED STATES PATENT. OFFICE.

I ABIUS JEAN-BAPTIST; I BApBZBABOU, OF PARIS, FRANCE. 1

' common or cannunn'roas.

Application filed February 83, 1924, Serial Io. 894,804, and in France larch 24,

When an engine is .intended to work at crease the ratio of-volumetric compression I of the engine at high altitudes, so as to have an en e which is still powerful at these altitu as But under these conditions, if the engines were operated on the ground upon full-gas admission, this would result in an abnormal strain on the engine; it is thus re uired to reduce the volume of gas admitte into the cylinders at low altitudes, and in order that the pilot or the driver shall not forget to reduce this volume, it'is preferable'to use an-automatic device.

The present invention has for its object a device for the control of the throttle valve of the carburetor or carburetors of an internal'combustion engine and in particular of 0 aviation engines, one feature whereof resides in that it com rises an elastic diahragm or like mem 1, one face whereof is subjected to a pressure substantially equal 13.

T0 the link 8 is attached a rod 14 which to the atmoslplheric pressure at the lowest altitude at w 'ch the engine is intended to work, while its other face is subjected to the surroundin atmospheric pressure, means being provide for o ratively connecting said diaphragm to t e transmission gear and whereby a. further movement is imparted to saidtransmission gear according to the altitude and v the opening" of the throttle valve of the carburetor, or of each carburetor, increases with the altitude.

By the use ofthis device the engine may give its whole power at high altitudes, and there is no risk, at low altitudes, of damaging the en e since themaximum possib openin o the carburetor'throttle will be reduce in an automatic manner.

Other features of the invention will be set forth in the following description.

In the appended drawing given by way of example Fig. 1 shows di tion of the contro invention.

2 is a section on a larger scale, on'the .lme -A (Fig. 3) of a detail.

ammatically a construcdevice according to the Fig. 3 is a section on the line B-B (Fig.

is mounted on a spindle 3 secured to an arm 4 connected by a link 5 withthe end of a swinging lever 6 movable on the spindle 7. This spindle 7 provides for the simultaneous control of several carburetors, which is necessa since aviation engines are usually provide with two carburetors. To this end, an arm parrallel to the lever 6 and actuating, by a. link analogous to the link 5, the thrott e of the other carburetor, is mounted on the spindle 7.

. At the other end of the lever 6, or at the end of another-arm secured to the spindle 7, is mounted a link 8 which carries at its other end a roller 9"en a d in the guide slot,10 of a sectorshape ever 11, movable on the shaft 12 and actuated b the pilot by means of the rod, or rod and link gear is secured on the other hand to a membrane or elastic diaphragm 15 forming the bottom of a hermetically closed chamber 16 in which prevails the atmospheric ressure on the ground or a pressure somew at higher. The membrance 15 is constantly urged by a spring 17 which tends to bring it towards the to consequently with the link 8.

l he operation of the ,device is 'as folows:

In the construction shown in Fig. 1, 1 is .the throttle of thecarburetor 2, and which On the ground or at a low altitude, the

pressure in the chamber 16 and the force 'of the spring 17 are such that the link8 is raised, and has the position shown in full and dotted lines at 8. Inthese conditions, the pilot acting on the rod and link ear 13 in order tomove the tlirottle 1 of t e car-- buretor 2, can only, for a given stroke of 0scillation of the lever 11 on its spindle 12, impart a small oscillation to the shaft 7 and glance obtain a small opening for the throte 1. But when the gengine" rises in the air the surroundhfiatnfospheric pressure will diminish, -an the 1n the chamber 16 thus preponderates and is exercised on the Y diaphragm 15, com ressing the spring 17 position and lowering the ro ler of the link 8 in the slot of the lever 11. It results therefrom that, for a given angle of. oscillation of this lever 11 on the spindle 12 under the action of the rod and link gear 13, the shaft 7 will turn through a greater angle than what it turned through when the link 8 was inthe osition 8, so that the throttle 1 will open further. The throttle can be open to the maximum onl when the altitude reached is such that t e link 8 is lowered into the 8 A .One. ill observe that if the lever 11 is disposed so that in the position of Fig. 1

the centre of the circle of the slot 10 is located at the point where the link8 is attached to the lever 6, whatever may be the movements imparted by the manometric chamber to the link 8, no action will be felt on the throttle of the carburetor. adjust the controls so that this position of the lever 11 corresponds to the position of the throttle for the slow speed of the engine.

Obviously the construction of the transmission ear, comprising the curved lever 11 and t e rod 8 shown in Figs. 2 and 1), is given solely by way of example, and it might be replaced by any other evice producing the same effect, that is to say admitting t e modification of the maximum openin of the carburetor according to the altitu e at which the engine is working.

Having now described my invention what I claim as new and desire to secure by Letters Patent is: 1. A transmission gear for the controlof the carburetor of an internal combustion engine comprising a control member, a rod and link gear operatively connecting said control member with the throttle valve of the carburetor, an elastic membrane one face.

whereof is subjected to a ressure substantially equal to the atmospheric pressure at the lowest altitude at which the en e is intended to work, while its other ace is subjected 'to the surrounding atmospheric ressure and means for operativel connectmg said membrane to one rod 0 saidirod and link gear, said rod being ada ted to slide len on the preceding link whereby -h of said link may be varied and the ratio of the transmission of movement is varied in accordance with the altitude and increases at the same time as the latter.

2. A transmission gear for the control of the carburetor of an internal combustion engine coniprising a control member, a sectorshaped slide member ivoted at one end and operatively connecte at itsother endwith said control member, a rod one end whereof is adapted to slide on said slide member means for operatively connec said to the throttle valve of the ca ni'etor, an

One can e operativeand operatively connecte at its other end with said control member, a rod one end whereof is adapted to slide on said slide member, a rod and link ear operatively connecting the other end of throttle valve of the carburetor, the centre of said sector-shaped slide member coinciding with said other end of said rod when the latter is in its mean angular position, an

said, rod to the p g elastic membrane one face whereof is subjected to a pressure substantially equal to theatmospheric pressure at the lowest altitude at which the engine is intended to work, while'its other face is subjected to the surrounding atmospheric pressure and means for operatively connecting said membrane to said rod.

4. A control gear for the carburetor of an internal combustion engine comprisin in combination a control member operated by the operator, a rod and link gear operatively.

connecting said control member to the carburetor throttle, an elastic membrane subjected on one face to a predetermined constant pressure and on the other face to the surrounding atmospheric pressure, and means operatively connecting said membrane with one link of said gear and whereby the angular position of said link is varied in accordance with the altitude at which the engine is working.

5. A control gear for the carburetor of an internal combustion engine comprising in combination a control member operate by the operator, a rod and link" gear operatively connecting said control member to the carburetor throttle, a tightreceptacle one wall whereof is constituted by an elastic membrane the outer face whereof is subjgcted to and whereb the angular 'tion of. saidlink is vari d-in accordanc d vi'ith the alti-.

tude at which the en e is working.

6. A control gear or the carburetor of an internal combustion engine comprising a control member operat by the ope'ra tor, a rod and link.gear embod ing arms respectively member and to the carburetor throttle, an intermediate member upon which said arms are jointed, and an elastic membrane subjected on one face to a predetermined constant pressure and on the other face to the surrounding atmospheric pressure,

means for operatively connecting said intermediate member to said elastic membrane and v and whereby the angular position of said arm connected to the carburetor throttle is varied in accordance with the altitude at which the engine is working.

In testimony whereof I have signed my name to this specification.

IARIUS mm-nms'rr ramnou. 

